Keeping expandability has a crucial feature; different sizes mean different uses, problems to solve, and different settings to use the pack in. The ATD2 had to be compact, conceived for fast services, more commuter-friendly, more easily accessible, ideal for those short weekend trips (or longer ones, if you are minimalist enough), and perfect for those who want (or have) to travel with checked luggage and still need a compact, yet expandable, travel backpack to pair it with.
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